Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Muscovite GDS113 Ruby DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS113, GDS113a

MINERAL_TYPE: Phyllosilicate

MINERAL: Muscovite (Mica group)

FORMULA: KAl2Si3O10(OH)2

FORMULA_HTML: KAl₂Si₃O₁₀(OH)₂

COLLECTION_LOCALITY: Brazil

ORIGINAL_DONOR: C.V. Clemency, SUNY

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sample is composed of white particles.
GDS113 particle size is greater than 37 microns (grain size and the acronynm XRD are marked on the bottle).
GDS113a particle size is not specified.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
References: Bailey (1984, p. 574), Huebner's reference patterns
Found: dioctahedral mica, 2M1 polytype
Sought but not found: quartz, (100) would be distinct if present

Comments: Very similar patterns. Only mica detected. The mica (004) reflection is at 17.6-17.9 degrees 2 theta; indicating a large alkali such as potassium (the dioctahedral Na-mica, paragonite, has the (004) reflection at 18.4 degrees) small sample size required smear mounts, which are responsible for a strong preferred basal orientation in each of the patterns."

J.S. Huebner, J. Pickrell, and J. Randow, 1993, written communication.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EPMA, ICP(Trace), WChem

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: SiO2 45.89 wt% SiO₂

COMPOSITION: TiO2 0.32 wt% TiO₂

COMPOSITION: Al2O3 35.64 wt% Al₂O₃

COMPOSITION: Fe2O3 1.08 wt% Fe₂O₃

COMPOSITION: FeO 0.81 wt% FeO

COMPOSITION: MnO 0.02 wt% MnO

COMPOSITION: MgO 0.56 wt% MgO

COMPOSITION: Na2O 0.78 wt% Na₂O

COMPOSITION: K2O 10.00 wt% K₂O

COMPOSITION: F 0.23 wt% F

COMPOSITION: H2O+ 4.84 wt% H₂O⁺

COMPOSITION: Total 100.17 wt%

COMPOSITION: O=Cl,F,S 0.10 wt% #correction for Cl, F, S

COMPOSITION: New Total 100.07 wt%

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	SiO2	45.89	wt%	SiO₂
COMPOSITION:	TiO2	0.32	wt%	TiO₂
COMPOSITION:	Al2O3	35.64	wt%	Al₂O₃
COMPOSITION:	Fe2O3	1.08	wt%	Fe₂O₃
COMPOSITION:	FeO	0.81	wt%	FeO
COMPOSITION:	MnO	0.02	wt%	MnO
COMPOSITION:	MgO	0.56	wt%	MgO
COMPOSITION:	Na2O	0.78	wt%	Na₂O
COMPOSITION:	K2O	10.00	wt%	K₂O
COMPOSITION:	F	0.23	wt%	F
COMPOSITION:	H2O+	4.84	wt%	H₂O⁺
COMPOSITION:	Total	100.17	wt%
COMPOSITION:	O=Cl,F,S	0.10	wt%	#correction for Cl, F, S
COMPOSITION:	New Total	100.07	wt%

Lin, F.C. and C.V. Clemency, 1981, Geochimica et Cosmochimica Acta 45, no. 4.

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4a # GDS113 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # GDS113a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns